Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: United’s CHS → IAH flights land within a few points of 87% on time whatever the hour.

Nonstops (seasonal or thin)


United	CHS	IAH	2h 54m	87%	0.6%	688	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Houston on time. Total trip = scheduled departure to arrival, layover included (Houston is 1 h behind Charleston). Layovers up to 4 hours. Pick a connection for the details.


American Details →	CHS 05:00 → CLT 06:01AA 3298	1h 41m Charlotte	CLT 07:42 → IAH 09:25AA 1930	5h 25m	98%	87%
Delta Details →	CHS 07:20 → ATL 08:34DL 1664	3h 56m Atlanta	ATL 12:30 → IAH 13:38DL 1572	7h 18m	99%	84%
United Details →	CHS 06:00 → ORD 07:33UA 2333	2h 52m Chicago	ORD 10:25 → IAH 13:23UA 2638	8h 23m	97%	83%
Delta Details →	CHS 05:10 → ATL 06:21DL 3055	3h 44m Atlanta	ATL 10:05 → IAH 11:18DL 1682	7h 08m	100%	80%
United Details →	CHS 10:00 → IAD 11:37UA 1858	1h 13m Dulles	IAD 12:50 → IAH 15:11UA 1535	6h 11m	94%	79%
United Details →	CHS 06:00 → EWR 07:59UA 1289	2h 54m Newark	EWR 10:53 → IAH 13:38UA 556	8h 38m	98%	73%
United Details →	CHS 11:31 → ORD 13:09UA 592	2h 56m Chicago	ORD 16:05 → IAH 19:10UA 714	8h 39m	98%	72%
Delta Details →	CHS 18:26 → ATL 19:46DL 2174	2h 58m Atlanta	ATL 22:44 → IAH 23:56DL 1601	6h 30m	97%	71%
Tight connection: often missed
American Details →	CHS 18:17 → CLT 19:40AA 5672 · flown by PSA	1h 05m Charlotte	CLT 20:45 → IAH 22:27AA 1840	5h 10m	73%	49%
United Details →	CHS 15:08 → ORD 16:54UA 3426 · flown by Republic	51m Chicago	ORD 17:45 → IAH 20:50UA 1954	6h 42m	59%	41%
American Details →	CHS 15:42 → DFW 17:39AA 1656	57m Dallas-Fort Worth	DFW 18:36 → IAH 19:54AA 1392	5h 12m	58%	28%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

ATL · 1h 09m · leaves 05:10 2%

IAD · 1h 13m · leaves 10:00 6%

ORD · 1h 18m · leaves 06:00 6%

Afternoon and evening

CLT · 1h 05m · leaves 18:17 27%

ORD · 51m · leaves 15:08 41%

DFW · 57m · leaves 15:42 42%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


Delta DL 789 CHS 08:20 → ATL United UA 425 ATL 11:37 → IAH Connection details →	2h 03m	5h 27m	98%	86%
American AA 3089 CHS 06:00 → DCA United UA 2190 DCA 10:58 → IAH Connection details →	3h 23m	8h 19m	100%	84%
Southwest WN 1141 CHS 06:30 → BNA United UA 5332 BNA 08:40 → IAH Connection details →	1h 45m	5h 32m	96%	83%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON